Precipitated silica used as reinforcing filler for elastomers

Details Precipitated silica used as reinforcing filler for elastomers Precipitated silica used as reinforcing filler for elastomers

C - Chemistry, Metallurgy

01

B

C01B 33/193 (2006.01) C08K 3/36 (2006.01) C09C 1/28 (2006.01)

Patent

CA 2261618

The invention concerns a novel method for preparing precipitated silica used as reinforcing filler for elastomers. It also concerns novel silica precipitates in the form of powder, granules or, preferably, substantially spherical balls, said silica being characterised in that they contain: a BET specific surface area ranging between 185 and 250 m?2¿/g; a CTAB specific surface area ranging between 180 and 240 m?2¿/g; a porous distribution such that the porous volume V2 consisting of pores with diameter ranging between 175 and 275 .ANG. represents less than 50 % of the porous volume V1 consisting of pores with diameter not more than 400 .ANG.; a porous volume (V¿d1?) consisting of pores with diameter less than 1 µm more than 1.65 cm?3¿/g; a fineness number (I.F) between 70 and 100 .ANG.; a fines contents (?¿f?) after ultrasound disintegration, of at least 50 %.

L'invention concerne un nouveau procédé de préparation de silice précipitée utilisable comme charge renforçante pour élastomères. Elle est aussi relative à de nouvelles silices précipitées sous forme de poudre, de granulés ou, de préférence, de billes sensiblement sphériques, ces silices étant caractérisées par le fait qu'elles possèdent: une surface spécifique BET comprise entre 185 et 250 m2/g, une surface spécifique CTAB comprise entre 180 et 240 m2/g, une distribution poreuse telle que le volume poreux V2 constitué par les pores dont le diamètre est compris entre 175 et 275 .ANG. représente moins de 50 % du volume poreux V1 constitué par les pores de diamètres inférieurs ou égaux à 400 .ANG., un volume poreux (Vd1) constitué par les pores de diamètre inférieur à 1 µm supérieur à 1,65 cm3/g, un indice de finesse (I.F.) compris entre 70 et 100 .ANG., un taux de fines (f), après désagglomération aux ultra-sons, d'au moins 50 %.

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